<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>JavaScript</title>
    <style>
    h1{
        width: 300px;
        height: 200px;
        background-color: coral;
        line-height: 190px;
        margin: 350 auto;
        color: #fff;
        
    }
    </style>
</head>
<body>
</body>
   <script type="text/javascript" src="上机练习2.js"></script>
</html>